Alloy



. New York, have inven palladium, although it UNITED STATES PATENT oEEIoE.

' GEORGE L. van ALLEN, 0E ramcE BAY, NEW ORK, assrenoa' ro BAKER & comrm,

- me, A coaronarron or NEW JEasEY. 4

ALLOY.

1,339,000. a n l q mmmm. Patented May 4', 1920. Ho Drawing. Application fled September 21, 1918. Serial No. 255,070.

To all whom it may concern.-

Be it known that I,- GEORGE L. Van

ALLEN, a citizen of the United States, and

-a resident of Prince Ba Staten Island, new and useful Improvements in Alloys,of which the following is a specification.

The objects of this invention are to secure an allofi which can be used instead of platinum a particularly for clasps, posts and so forth; to obtain such an alloy with cat resiliency or spring, so that it is well a apted for suchuses; to secure in such an alloy other desirable and necessaryqualities for dental work, such as a pleasing color, resistance to attack by saliva and so. forth, and to obtain other advantages and results as may be brought out in the following description.

In carrying out my invention I melt together gold, silver, copper and *palladiung as the basis or foundation of my-improve alloy, to which is added a small amount of some metal which will act as a stifiener to- 15 needed, but a so magnesium, zinc, tin, and

80 probably other metals, can be employed for the same purpose.

In making my new alloy, 1 have used the followin parts by weight,-.-6% of gold,

181% 0 silver, 9% of co per and 8%. of

that these proportions might be somewhat 'desired resiliency.

oys for dental purposes and more be understood varied or departed from. This'forms the basis or foundation of the alloy,to which only relatively small quantities of the stiffemng metal need be added to obtain the p I have found that 1% of aluminum is suflicient ea add, although rather more magnesium is necessary, about 1%, 'th a corresponding decrease in the amount of silver. The alloy thus formed cannot be distinguished in color and appearance from those previously used contaimn'g platinum and is resilient to even a greater degree It has all the other necessary and desirable ualities of a metal for dental work, and is t arefore well adapted :for su'ch purposes. At

' obviously it can be employed wherever de- JHn'vin thus described the invention, what I c aim is.

1. An alloy containing lgold, silver, copper, palladium and a at mng metal, in substantially the proportions stated.

. 2. An alloy containmggold, silver, copper, palladium and aluminum, in substantially the proportions stated.

a 3. An alloy containing 64% of gold, 182% of-silver, 9% of copper, 8% of palladium and 1 of a stifiem'ng metal.

4. An alloy containing 64% of gold, 18&% of silver, 9% of copper, 8% of palladium and 1% of aluminum; p

' GEORGE L. VAN ALLEN. 

